Device and method for preparing porous foam metal by metal melt inflation process

Abstract

The invention discloses a device and a method for preparing porous foam metal by a metal melt inflation process. The device comprises a metal melt groove, a foaming chamber, a fluid hole, a release valve and a metal crystallizer. The middle of the metal crystallizer is provided with a high-frequency ultrasonic oscillator; and the high-frequency ultrasonic oscillator is connected with a high-frequency ultrasonic power source used for adjusting the oscillation frequency, amplitude and power of the high-frequency ultrasonic oscillator. The high-frequency ultrasonic oscillator is started, when the bubble-containing metal melt passes through the metal crystallizer, bubbles are subjected to ultrasonic oscillation for fragmentation under the action of the high-frequency ultrasonic oscillation, and a bubble is fragmented into several smaller bubbles; and the oscillation frequency and the amplitude of the high-frequency ultrasonic oscillator are adjusted, so that the fragmentation degree and the size of the bubbles meet the requirements. The bubbles formed by high-frequency ultrasonic oscillation have uniform size and distribution; and the device and the method have the advantages of simple process and low cost, and are suitable for large-scale production, promotion and application.

Description

technical field [0001] The invention belongs to the metal material preparation technology in the field of mechanical engineering, in particular to a device and a method for preparing porous foam metal by a metal melt aeration method. Background technique [0002] Due to its special structural form, the porous metal material with foam structure not only has general metal properties such as weldability, conductivity, and ductility, but also has the advantages of energy absorption and shock absorption, high damping, noise reduction, heat insulation and exchange. Heat, electromagnetic shielding, breathable and water-permeable, etc. have shown their own characteristics, and have been widely used in industry, medical and health, construction industry, environmental protection, and high-tech fields. According to the state of the metal during the preparation process, the preparation methods of porous metal foam mainly include liquid phase method, solid phase method and metal deposit...

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Problems solved by technology

[0003] 1. Metal hydride decomposition and foaming method Because the decomposition process of metal hydride is difficult to control, the bubbles formed by it have the same problem of high cost as the foaming method of direct blowing method; and because of the existence of H, it is easy to form hydrogen embrittlement and deteriorate the metal The mechanical properties are only suitable for the foaming of Al and Mg metals, but not for Ti metals and their alloys.

[0004] 2. The foaming of Al metal can only be prepared by the direct inflation foaming method, but in the preparation process, due to the aggregation and merging of bubbles, the size of the pores in the Al foam metal is difficult to control, and the size of the pores is different, so adversely affect the properties of the material

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